MATTER ACCUMULATION AND PHOTOSYNTHETIC RESPONSES OF MACAW PALM TO CYCLICAL DROUGHT
DOI:
https://doi.org/10.1590/1983-21252016v29n409rcKeywords:
Acrocomia aculeata. Photosynthesis. Water use efficiency. Plant-water relations.Abstract
The objective of this work was to evaluate the plant-water relations, photosynthetic parameters and growth of macaw (Acrocomia aculeata (Jacp.) Lodd. ex Mart.) plants, thus, ten plants were subjected to three successive drought and rehydration cycles and ten other plants were irrigated normally as control. The drought cycles consisted of a suspension of irrigation until the net CO2 assimilation rate (A) reach values lower than 5% of the control, and a rehydration until a plants recover at least 85% of A of the control plants. Reductions in A, stomatal conductance (gs) and transpiration (E), above 95%, were found with predawn leaf water potential (Ypd) of -1.85 MPa. After rehydration, the gs and E of plants with and without water stress was not different, however, A presented a significant difference. Leaf water potentials below -0.5 MPa reduced the intracellular and atmospheric CO2 ratio and increased water use efficiency, and values of -1.85 MPa, when both showed an increase and decrease, respectively. The reduction of A and gs was linear and proportional to Ypd. Total dry matter accumulation reduced by 50% in the plants subjected to drought. The cyclic water stress resulted in reduction of gas exchange and matter accumulation in macaw palm plants; a stomatal limitation of A occurred until Ypd of -1.85 MPa, and then a non-stomatal limitation.Downloads
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References
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Universidade Federal de Viçosa. Processo de germinação e produção de sementes pré-geminadas de palmeiras do gênero Acrocomia. Disponível em: https://gru.inpi.gov.br/pePI/servlet/ImagemDocumentoPdfController?CodDiretoria=200&PswdID=ew82p&NumeroID=7f8fdbd8762ec92f6fa7fd5533b854aa2a4e0b906147d250019db1dcf624b8f6&codPedido=744932. Acesso em 10 jun. 2016.
VARONE, L. et al. Stomatal and non-stomatal limitations to photosynthesis in seedlings and saplings of Mediterranean species pre-conditioned and aged in nurseries: Different response to water stress. Environmental and Experimental Botany, Amsterdam, v. 75, p. 235-247, 2012.
CALBO, M. E. R.; MORAES, J. A. P. V. Efeitos da deficiência hídrica em plantas de Euterpe oleracea (açaí). Revista Brasileira de Botânica, São Paulo, v. 23, n. 3, p. 225-230, 2000.
CALBO, M. E. R.; MORAES, J. A. P. V. Fotossíntese, condutância estomática, transpiração e ajustamento osmótico de plantas de buriti submetidas a estresse hídrico. Revista Brasileira de Fisiologia Vegetal, Campinas, v. 9, n. 2, p. 117-123, 1997.
CHAVES, M. M.; FLEXAS, J.; PINHEIRO, C. Photosynthesis under drought and salt stress: regulation mechanisms from whole plant to cell. Annals of Botany, London, v. 103, n. 4, p. 551-560, 2009.
DOURADO-NETO, D. et al. Software to model soil water retention curves (SWRC, version 2.00). Scientia Agricola, Piracicaba, v. 57, n. 1, p. 191-192, 2000.
GALMÉS, J.; MEDRANO, H.; FLEXAS, J. Photosynthetic limitations in response to water stress and recovery in Mediterranean plants with different growth forms. New Phytologist, Oxford, v. 175, n. 4, p. 81–93, 2007.
GLYN BENGOUGH, A. et al. Root elongation, water stress, and mechanical impedance: a review of limiting stresses and beneficial root tip traits. Journal of Experimental Botany, Lancaster, v. 62, n. 1, p. 59–68, 2011.
GOMES, F. P. et al. Photosynthetic limitations in leaves of young brazilian green dwarf coconut (Cocos nucifera L. ‘nana’) palm under well-watered conditions or recovering from drought stress. Environmental and Experimental Botany, Amsterdam, v. 62, n. 3, p. 195-204, 2008.
GOMES, F.P. et al. Is abscisic acid involved in the drought reponses of brazilian green dwarf coconut? Experimental Agriculture, New York, v. 45, n. 2, p. 189-198, 2009.
GOMES, F. P.et al. Osmotic adjustment, proline accumulation and cell membrane stability in leave of Cocos nucifera submitted to drought stress. Scientia Horticulturae, Amsterdam, v. 126, n. 3, p. 379-384, 2010.
MIYASHITA, K. et al. Recovery responses of photosynthesis, transpiration, and stomatal conductance in kidney bean following drought stress. Environmental and Experimental Botany, Amsterdam, v. 53, n. 2, p. 205-214, 2005.
MULLER, B. et al. Water deficits uncouple growth from photosynthesis, increase C content, and modify the relationships between C and growth in sink organs. Journal of Experimental Botany, Lancaster, v. 62, n. 6, p. 1715–1729, 2011.
OLIVEIRA, M. A. J. et al. Fotossíntese, condutância estomática e transpiração em pupunheira sob deficiência hídrica. Scientia Agricola, Piracicaba, v. 59, n. 1, p. 59-63, 2002.
PIMENTEL, L. D. et al. Recomendação de adubação e calagem para o cultivo da macaúba: 1a aproximação. Informe Agropecuário, Belo Horizonte, v. 32, n. 265, p. 20-31, 2011.
PINHEIRO, C.; CHAVES, M.M. Photosynthesis and drought: can we make metabolic connections from available data? Journal of Experimental Botany, Lancaster, v. 62, n. 3, p. 869-882, 2011.
RICHARDS, L. A. Porous plate apparatus for measuring moisture retention and transmission by soils. Soil Science, Baltimore, v. 66, n. 2, p. 105–110, 1948.
SANTOS, O. O. et al. Desempenho ecofisiológico de milho, sorgo, e braquiária sob déficit hídrico e reidratação. Bragantia, Campinas, v. 73, n. 2, p. 203-212, 2014.
SKIRYCZ, A.; INZÉ, D. More from less: plant growth under limited water. Current Opinion in Biotechnology, London, v. 21, n. 2, p. 197–203, 2010.
SURESH, K. et al. Changes in photosynthetic activity in five common hybrids of oil palm (Elaeis guineensis Jacq.) seedling under water deficit. Photosynthetica, Praha, v. 50, n. 4, p. 549-556, 2012.
SURESH, K. et al. Gas-exchange characteristics, leaf water potential and chlorophyll a fluorescence in oil palm (Elaeis guineensis Jacq.) seedlings under water stress and recovery. Photosynthetica, Praha, v. 48, n. 3, p. 430-436, 2010.
Universidade Federal de Viçosa. Processo de germinação e produção de sementes pré-geminadas de palmeiras do gênero Acrocomia. Disponível em: https://gru.inpi.gov.br/pePI/servlet/ImagemDocumentoPdfController?CodDiretoria=200&PswdID=ew82p&NumeroID=7f8fdbd8762ec92f6fa7fd5533b854aa2a4e0b906147d250019db1dcf624b8f6&codPedido=744932. Acesso em 10 jun. 2016.
VARONE, L. et al. Stomatal and non-stomatal limitations to photosynthesis in seedlings and saplings of Mediterranean species pre-conditioned and aged in nurseries: Different response to water stress. Environmental and Experimental Botany, Amsterdam, v. 75, p. 235-247, 2012.
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13-09-2016
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